'\" te
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.TH DAT_EVD_SET_UNWAITABLE 3DAT "Jul 16, 2004"
.SH NAME
dat_evd_set_unwaitable \- transition the Event Dispatcher into an unwaitable
state
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR\&.\|.\|. ] \fIfile\fR\&.\|.\|. \fB-ldat\fR [ \fIlibrary\fR\&.\|.\|. ]
#include <\fBdat/udat.h\fR>

DAT_RETURN
    dat_evd_set_unwaitable(
    IN    DAT_EVD_HANDLE    \fIevd_handle\fR
    )
.fi

.SH PARAMETERS
.sp
.ne 2
.na
\fB\fIevd_handle\fR\fR
.ad
.RS 14n
Handle for an instance of Event Dispatcher.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBdat_evd_set_unwaitable()\fR transitions the Event Dispatcher into an
unwaitable state. In this state, calls to \fBdat_evd_wait\fR(3DAT) return
synchronously with a \fBDAT_INVALID_STATE\fR error, and threads already blocked
in \fBdat_evd_wait()\fR are awakened and return with a \fBDAT_INVALID_STATE\fR
error without any further action by the Consumer. The actual state of the Event
Dispatcher is accessible through \fBdat_evd_query\fR(3DAT) and is
\fBDAT_EVD_UNWAITABLE\fR after the return of this operation.
.sp
.LP
This call does not affect a CNO associated with this EVD at all. Events
arriving on the EVD after it is set unwaitable still trigger the CNO (if
appropriate), and can be retrieved with \fBdat_evd_dequeue\fR(3DAT). Because
events can arrive normally on the EVD, the EVD might overflow; the Consumer is
expected to protect against this possibility.
.SH RETURN VALUES
.sp
.ne 2
.na
\fB\fBDAT_SUCCESS\fR\fR
.ad
.RS 22n
The operation was successful.
.RE

.sp
.ne 2
.na
\fB\fBDAT_INVALID_HANDLE\fR\fR
.ad
.RS 22n
The \fIevd_handle\fR parameter is invalid.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard: uDAPL, 1.1, 1.2
_
MT-Level	Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR dat_evd_clear_unwaitable (3DAT),
.BR dat_evd_dequeue (3DAT),
.BR dat_evd_query (3DAT),
.BR dat_evd_wait (3DAT),
.BR libdat (3LIB),
.BR attributes (7)
